configure/build issue with gcc 3.2.0 (PR#2176)

[ripley@stats.ox.ac.uk]

This has been discussed on R-devel, and it is definitely not an R bug
as there are workarounds stated in the R-admin manual.

Setting CPPFLAGS= (nothing) does avoid this except in the gnome module. It
was intended to put that explicitly in the R-admin manual for 1.6.0, but
it was not done in time (it is now there for R-patched).

We are told that this is fixed in the alphas of gcc 3.3.  Once it is clear
exactly which versions of gcc are affected we may add a workaround in the
configure script.

On Wed, 16 Oct 2002 rjvbertin@hotmail.com wrote:

> There is an incompatibility between R's configure/build process, and gcc 3.2.0 (and maybe earlier).
> Gcc 3.2.0 includes -I/usr/local/include by default, on my system (default configuration), and cpp0
> issues a warning when this flag is issued additionally by the user (= R's configure). This warning
> ends up in the dependency sections of the Makefile that are generated "automagically". The 1st
> occurrence is line 105 of src/appl/Makefile .
>
> The only way around it that I found, other than removing all -I/usr/local/include in all Makefiles is to manually add
> -Wp,-w, a gcc/cpp argument that suppresses all cpp warnings. It also has the effect of not aborting
> a compilation as soon as a specified header file is *not* found :(
> If you decide to leave -I/usr/local/include and add -Wp,-w for gcc 3 compilers, I would suggest
> *not* adding -Wp,-w if -fsyntax-only is also given, to not interfere with requested syntax-checking.
> (that would probably require to call the compiler from a wrapper script, something I already do.)
>
> Rene Bertin
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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